Ludwig vibneisel



- UNITED STATES PATENT OFFICE.

LUDXVIG VIRNEISEL, OFMANNHEIM, BADEN, GERMANY.

METHOD OF MANUFACTURING HYDRATED GRAPE-SUGAR.

SPECIFICATION forming part of Letters Patent No. 310,339, dated January 6, 1885.

Application filed August 31, 1882.

To all whom it may concern:

Be it known that I, LUDWIG VIRNEISEL, of Mannheim, Baden, Germany, have invented certain new and useful Improvements in the Manufacture of Grape-Sugar, of which the following is a specification.

This invention relates to an improved method of manufacturing hydrated grape-sugar without the employment of alcohol or similar separating agents; and the invention consists in making hydrated grape-sugar by first forming a magma of crystals of grape-sugar from a starch-glucose solution of a density of to saccharometer, then mixing the magma with a thin colorless juice of grapesugar and draining or washing off the sirup from the crystals, and finally drying the crystals at ordinary temperature.

In carrying out my invention a solution of grape-sugar (starch-glucose) of a density of twenty-five to thirty saccharometer degrees is allowed to crystallize at ordinary temperature. The co-efficient of purity of this solution should not be below 95-that is to say, the glucose solution should contain in one hundred parts not more than live parts which are not dextrose. The magma of crystals so formed is mixed at ordinary temperature, as rapidly and inti,

mately as possible, with one-half to an equal Volume of a thin colorless juice of grapesugar of 20 saccharometer scale in a macerator, such as are employed in beet-sugar factories. The resulting thin starch-glucose mash is transferred to a suction apparatus, and the grape-sugar drained from the juice. This draining or washing operation with thin saccharine juice is repeated twice or three times, until pure white crystals of sugar are obtained, which are dried at ordinary temperature by means of a current of air. By thus forming first a magma of grape-sugar crystals, mixing them with thin juice orliquor by mechanical means, and separating then the uncrystallizable substances-such as sirup or 1no1assesfrom the crystals by a suction ap paratus, and then producing the complete re moval of the uncrystallizablc or unfermentable substances from the crystals by repeatedly washing or draining them by means of a thin colorless juice at ordinary temperature, the use of alcohol or similar separating agents (No specimens.)

which have heretofore been employed in the production of hydrated grape-sugar is dispensed with and a pure white grape -sugar monohydrate obtained, which contains from eighty-nineto ninety-one per cent. of dextrose and from eleven to nine per cent. of water, and which, in contradistinction to the ordinary glucose of commerce, does not polarize to the right after fermentation.

I am aware that impurities have been removed from raw sugar by first mixing the same with a sugar sirup or liquor, and then Washing theso-prepared raw sugar in a centrifugal machine.

I am also aware that refined cane-sugar has been mixed with grape-sugar by first draining the sugar magmas oftheir contained sirups, and then washing the drained sugar by a suitable washing-liquor, and finally charging the drained and washed sugars with a solution containing grape-sugar. I, therefore, do not claim the processes referred to. The difference between these processes and my method consists, essentially, in forming, first,a magma of crystals of grape-sugar hydrate from a starch-glucose solution of a determined density and purity, and then washing and draining the same until the pure crystals of hydrated grape-sugar are obtained.

Having thus described my invention, I claim as new and desire to secure by Letters Patent The process herein described of making by drated grape-sugar, which consists, first, in forming a magma of crystals of grape-sugarhydrate from a starch-glucose solution of twentyfive to thirty saccharometer degrees, and of a coefficient of purity of 95; secondly, mixing the magma thoroughly with a thin colorless juice of grape-sugar thirdly, draining or washing ofi'the sirup from the crystals and repeating the washing operation until the uncrystallizable or unfermentable substances are entirely separated from the crystals of hydrated grape sugar, substantially as specified.

In testimony that I claim the foregoing as my invention I have signed my name in pres ence of two subscribing witnesses.

LUDXVIG VIRNEISEL.

Vitnesses:

MARTIN SAENGER, Go. FRIED. G-uijlv. 

